Heated Glass Element: Description and Operation

The rear window defogger system is controlled by the smart entrance control unit. The rear window defogger
operates only for approximately 15 minutes.
Power is supplied at all times
- to rear window defogger relay terminal 3
- through 20 A fuse (No.7, located in the fuse and fusible link box) and
- to rear window defogger relay terminal 6
- through 20 A fuse (No.4, located in the fuse and fusible link box).
- to smart entrance control unit terminal 10
- through 10 A fuse (No.13, located in the fuse and fusible link box).
With the ignition switch in the ON or START position, power is supplied
- through 10 A fuse [No.10, located in the fuse block (J/B)]
- to the rear window defogger relay terminal 1 and
- to smart entrance control unit terminal 33.
Ground is supplied to terminal 32 (with auto A/C) or 17 (with manual A/C) of the rear defogger switch (built-in A/C control unit or A/C auto amp.) through body grounds M9, M25 and M87.
When the rear defogger switch is turned ON, ground is supplied
- through terminal 31 (with auto A/C) or 9 (with manual A/C) of the rear defogger switch
- to smart entrance control unit terminal 39.
Terminal 2 of the smart entrance control unit then supplies ground to the rear window defogger relay terminal 2.
With power and ground supplied, the rear window defogger relay is energized.
Power is supplied
- through terminals 5 and 7 of the rear window defogger relay
- to the rear window defogger.
The rear window defogger has an independent ground.
With power and ground supplied, the rear window defogger filaments heat and defog the rear window.
When the system is activated, the rear window defogger indicator illuminates in the rear window defogger switch.
Power is supplied
- to terminal 30 (with auto A/T) or 10 (with manual A/T) of the rear window defogger switch
- from terminal 5 of the rear window defogger relay.
Terminal 32 (with auto A/T) or 17 (with manual A/T) of the rear window defogger switch is grounded through body grounds M15, M71 and M76.